Basionym Name:Placopsis gelida f. semireagens I.M. Lamb, Res. Norweg. Sci. Exped. Tristan da Cunha, 1937-1938 1(no. 3): 2 (1940)
Homotypic synonyms:Placopsis parellina f. semireagens (I.M. Lamb) I.M. Lamb, Lilloa 13: 250 (1947)